 The Jurassic Mawson Formation outcrops from Ballance Point until where these two ridges come together, and the Permian Weller Formation outcrops.Along the Shipton Ridge, the Triassic Feather Formation lies next to the Weller, followed by the Triassic Lashley Formation, which continues from Halle Flat and Roscolyn Tor, through Toltec Butte, until the northerly end of the ridge at Lavallee Point.Ferrar Dolerite is exposed at Coxcomb Peak.